Allen w



A. W. ROSE. TELEPHONE TRANSMITTER.

(No Model.)

PatentedApI 14, 1896.

WITNESSES:

INVENTOR BY B r 5 M ATTORNEY UNITED STATES PATENT OFFICE.

ALLEN w. ROSE, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 558,313, dated April 14, 1896.

Application filed August 2 9 18 9 5.

To all whom it may concern.-

Be it known that I, ALLEN ROSE, a citizen of the United States, residing in the city of New York, county of New York, and State of New York, have invented certain new and useful Improvements in Telephone-Transmitters, of which the following is a full, clear, exact, and concise description, reference bein g had to the accompanying drawings, forming a part of this application.

In the different figures similar designatingcharacters refer to like parts.

My invention relates to granulated or comminuted carbon transmitters, and has for its object to produce an instrument that is extremely sensitive to sound-waves and at the same time one that is not easily deranged by loud speaking.-

A further object of my invention is to produce an instrument that is cheap in construction, having few parts, and requiring no sensitive adjustment.

In the drawings, Figure 1 is tional view of my transmitter. sectional view of a modification. and 5 show details.

Upon a frame or block a of insulating material-such as rubber, fiber, or wood-is mounted in the usual manner a diaphragm 1 in a diaphragm-seat 2. A casting or other piece of metal 3 is mounted across the back of the frame-piece a by means of screws 4:. In this casting 3 is an aperture 5, adapted to receive a spindle 6, held securely therein by a set-screw 7.

Upon the end of the spindle 6 is a fiat electrode 8, having a grooved circumference. In this grooved circumference is placed securely one edge of a conical ring of cured skin such, for example, as kid or chamois-fastened by a thread or wire 9. The other edge of this conical ring of kid is secured by a thread or wire 14 in a corresponding circumferential groove in the opposite electrode 13.

The electrode 13 is fastened to the diaphragm 1 by means of a screw 15. The eleca partly sec- Fig. 2 is a Figs. 3, 4t,

trode 13 is so shaped as not to interfere with the vibration of the diaphragm 1.

Upon the electrodes 8 and 13 are securely connected the carbon faces 11, adapted to Serial No. 560,893. (No model.)

make good contact with the granulated or comminuted carbon 12, supported within the ring 10 of kid.

The circuit of this telephone-transmitter is from a wire connected to the diaphragm 1, through electrode 13, carbons 11 and 12, electrode 8, spindle 6, set-screw 7, casting 3, to a wire connected thereto.

In the modification shown in Fig. 2 instead of a single conical ring of kid a double conical ring 21 22 is used. The construction of the various parts is varied to correspond. Upon the electrode 23 is a rigid screw 24., passin g through a hole in a washer of kid 22 and then through a stiff metallic washer 26, these parts being securely screwed together by means of a screw-nut 25. The nut serves to hold these parts to the diaphragm 1. In like manner the spindle 6 is provided with a screw portion 18, passing through the metal washer 19, the kid 21, and into the electrode 20, binding these various parts securely together. Then the outer edges of the two rings of kid .21 and 22 are bound together by a metal clip 28, which may be so pinched as to hold itself firmly to the kid and at the same time hold the kid edges together so as not to let the comminuted carbon escape.

It is obvious that the details of my invention may be greatly varied without departing from the essential ideas which produce the simplicity, cheapness, and efficiency, and all such variations lie within the scope of my invention.

Fig. 3 shows a ring of kid for use in the modification in Fig. 2, and it has a hole 27 in its middle. It is obvious that this may be variously shaped and be made out of many the direction of its length. This principle is made use of in the cell, and by sloping the walls of the cell in a single or double cone the force of the diaphragm in its vibIations acts in a direction at an angle with the walls of the cell. Hence the diaphragm is not hindered or deadened in its action on the carbon with a cell of this kind as it is in cells having straight Walls.

The adjustment of the electrodes in my transmitter is not delicate, for they may be placed at almost any distance from each other that the kid will permit and the action remain unchanged.

To assemble the parts or to repair them requires no skilled labor, for a boy or girl can do the work in the most eflicient manner.

To collect the air waves and direct them against the center of the diaphragm, a mouthpiece 16 is fastened by means of a threaded portion 17 into a threaded hole in the frame a.

In Fig. 4 the modification resembles that in Fig. 1, except in the manner of attaching the electrode 13 to the diaphragm. In this figure a portion of the electrode 13 is left bare and fitted tightly into the ring or annulus 29. The circuit maybe as traced in Fig. 1, or the wire 30 may be connected directly to the electrode.

In Fig. 5 a stud 31, brazed or soldered to the diaphragm, fits into a corresponding hole in the electrode 13 and is held there tightly by friction. In this manner the electrode vibrates with the diaphragm.

Various other mechanical details may be used in place of those shown and described.

W'Vhat I claim, and desire to secure by Letters Patent, is

1. In a telephone, a diaphragm, electrodes, having a vibratory relation with each other, comminuted carbon mounted between said electrodes, and sloping flexible walls arranged at an angle to the direction of said vibration.

2. In a telephone, a diaphragm, electrodes having a vibratory relation with each other, comminuted carbon or resistance-varyin g material supported between said electrodes by a conical ring of flexible material.

3. In a telephone, a diaphragm, electrodes having a vibratory relation with each other, comminuted resistance varying material mounted in the electrical circuit between said electrodes and supported by a double flexible cone.

4. In a telephone, a (lit phragm, electrodes 20 and 23, a double flexible conical cell, 21, 22, a clip 28, and comminuted material 12.

5. In a telephone, a frame, a back-support, a diaphragm mounted in said frame, a spindle mounted on said back-support, two electrodes, one rigidly mounted on said spindle,

the other mounted rigidly on said diaphragm, and flexible material arranged in conical form supporting comminuted resistance-varying material in the circuit between said electrodes.

In testimony whereof I hereunto sign my name this 23d day of August, 1895.

ALLEN \V. ROSE. \Vitnesses:

MYRoN FRANCIS IIILL, CLARENCE l3. TRACY. 

